I think at the time, only the window, but not the scene scaled. So the windows was only filled 1 quarter. Just tested it It isn't the case anymore. But there still is problems with th "draw text". https://snag.gy/GwKhxk.jpg

The default font only has 1x which is why it doesn't look right at higher scales. Adding higher scales could be done, but most devs don't use the default font and it would add extra unused space for the higher scales.